Operculodinium echigoense
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"?echigoense" Matsuoka, 1983b, p.126, pl.7, figs.1,2a–b,3–5,8. Holotype: Matsuoka, 1983b, pl.7, fig.5; Matsuoka et al., 1997, pl.3, figs.1–3. Originally Operculodinium, subsequently (and now) Operculodinium?. Questionable assignment: Mudie (1987, p.804). Taxonomic senior synonym: Operculodinium centrocarpum, according to Matsuoka et al. (1997, p.22). Age: early middle Miocene.
Parent: Operculodinium